How do you know if $y = 2.5 {(0.8)}^{x}$ $y = 2.5(0.8)^x$ represents exponential growth or decay?

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Answer 1 · 2015-03-29T01:00:20

It representes an exponential decay.
If you look at your function you see that:
enter image source here

How do you know if y=2.5(0.8)xy = 2.5(0.8)^x represents exponential growth or decay?